New cosmological and experimental constraints on the CMSSM

Roszkowski, Leszek; Austri, Roberto Ruiz de; Nihei, Takeshi

doi:10.1088/1126-6708/2001/08/024

Cited by 200 publications

(82 citation statements)

References 63 publications

(95 reference statements)

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“…Initial and early studies [7,8,9,10] were followed by more recent work [11], where it was concluded that current experimental sensitivity is generally comparable with the ranges expected from the neutralino WIMP in the Minimal Supersymmetric Standard Model (MSSM). It is, however, still at least on order of magnitude, or so, above the ranges predicted by recent analyses of the Constrained MSSM (CMSSM) [12,13,14,15,16].…”

Section: Introductionmentioning

confidence: 74%

Upper and Lower Limits on Neutralino WIMP Mass and Spin–Independent Scattering Cross Section, and Impact of New (g−2)_μMeasurement

Kim

Nihei

Roszkowski

et al. 2002

J. High Energy Phys.

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Abstract:We derive the allowed ranges of the spin-independent interaction cross section σ SI p for the elastic scattering of neutralinos on proton for wide ranges of parameters of the general Minimal Supersymmetric Standard Model. We investigate the effects of the lower limits on Higgs and superpartner masses from colliders, as well as the impact of constraints from b → sγ and the new measurement of (g − 2) µ on the upper and lower limits on σ SI p . We further explore the impact of the neutralino relic density, including coannihilation, and of theoretical assumptions about the largest allowed values of the supersymmetric parameters. For µ > 0, requiring the latter to lie below 1 TeV leads to σ SI p ∼ > 10 −11 pb at m χ ∼ 100 GeV and σ SI p ∼ > 10 −8 pb at m χ ∼ 1 TeV. When the supersymmetric parameters are allowed above 1 TeV, for 440 GeV ∼ < m χ ∼ < 1020 GeV we derive a parameter-independent lower limit of σ SI p ∼ > 2 × 10 −12 pb. (No similar lower limits can be set for µ < 0 nor for 1020 GeV ∼ < m χ ∼ < 2.6 TeV.) Requiring Ω χ h 2 < 0.3 implies a parameter-independent upper limit m χ ∼ < 2.6 TeV. The new e + e − -based measurement of (g − 2) µ restricts m χ ∼ < 350 GeV at 1 σ CL and m χ ∼ < 515 GeV at 2 σ CL, and implies µ > 0. The largest allowed values of σ SI p have already become accessible to recent experimental searches.

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Section: Introductionmentioning

confidence: 74%

Upper and Lower Limits on Neutralino WIMP Mass and Spin–Independent Scattering Cross Section, and Impact of New (g−2)_μMeasurement

Kim

Nihei

Roszkowski

et al. 2002

J. High Energy Phys.

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“…Many of these analyses assume that the low-energy soft SUSY-breaking parameters of the MSSM may be extrapolated using the renormalisationgroup equations (RGEs) up to some grand unified theory (GUT) scale, where they are postulated to satisfy some universality conditions. Examples of such models include the constrained MSSM (CMSSM) [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], in which the soft SUSY-breaking mass parameters m 0 and m 1/2 are assumed to be universal at the GUT scale, as are the trilinear parameters A 0 . Other examples include models that relax the universality assumptions for the soft SUSY-breaking contributions to the Higgs masses, the NUHM1 [31][32][33][34] and NUHM2 [35,36] (see also, e.g., Ref.…”

Section: Introductionmentioning

confidence: 99%

The pMSSM10 after LHC run 1

et al. 2015

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We present a frequentist analysis of the parameter space of the pMSSM10, in which the following ten soft SUSY-breaking parameters are specified independently at the mean scalar top mass scale M SUSY ≡ √ mt 1 mt 2 :the gaugino masses M 1,2,3 , the first-and second-generation squark masses mq 1 = mq 2 , the third-generation squark mass mq 3 , a common slepton mass m˜ and a common trilinear mixing parameter A, as well as the Higgs mixing parameter μ, the pseudoscalar Higgs mass M A and tan β, the ratio of the two Higgs vacuum expectation values. We use the MultiNest sampling algorithm with ∼1.2 ×10 9 points to sample the pMSSM10 parameter space. A dedicated study shows that the sensitivities to strongly interacting sparticle masses of ATLAS and CMS searches for jets, leptons + / E T signals depend only weakly on many of the other pMSSM10 parameters. With the aid of the Atom and Scorpion codes, we also implement the LHC searches for electroweakly interacting sparticles and light stops, so as to confront the pMSSM10 parameter space with all relevant SUSY searches. In addition, our analysis includes Higgs mass and rate measurements using the HiggsSignals code, SUSY Higgs exclusion bounds, the measurements of BR(B s → μ + μ − ) by LHCb and CMS, other B-physics observables, electroweak precision observables, the cold dark matter density and the XENON100 and LUX searches for spin-independent dark matter scattering, assuming that the cold dark matter is mainly provided by the lightest neutralinoχ 0 1 . We show that the pMSSM10 is able to provide a supersymmetric interpretation of (g − 2) μ , unlike the CMSSM, NUHM1 and NUHM2. As a result, we find (omitting Higgs rates) that the minimum χ 2 = 20.5 with 18 degrees of freedom (d.o.f.) in the pMSSM10, corresponding to a χ 2 probability of 30.8 %, to be compared with χ 2 /d.o.f. = 32.8/24 (31.1/23) (30.3/22) in the CMSSM (NUHM1) (NUHM2). We display the one-dimensional likelihood functions for sparticle masses, and we show that they may be significantly lighter in the pMSSM10 than in the other models, e.g., the gluino may be as light as ∼1250 GeV at the 68 % CL, and squarks, stops, electroweak gauginos and sleptons may be much lighter than in the CMSSM, NUHM1 and NUHM2. We discuss the discovery potential of future LHC runs, e + e − colliders and direct detection experiments.

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“…The possibility of gluino coannihilation does not arise in the minimal supersymmetric extension of the Standard Model (MSSM) with the soft supersymmetry-breaking parameters constrained to be universal at the input GUT scale (the CMSSM) [14,[32][33][34][35][36][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92], nor in related models with non-universal Higgs masses [83,84,[93][94][95][96][97][98][99][100][101][102][103][104][105][106]. However, as we discuss in this paper, gluino coannihilation can become important in variants of the MSSM with non-universal gaugino masses, and in variations of pure gravity mediation (PGM) with non-minimal matter content such as additional vector-like supermultiplets [67][68][69].…”

Section: Introductionmentioning

confidence: 99%

Scenarios for gluino coannihilation

Ellis

Evans

Luo

et al. 2016

J. High Energ. Phys.

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We study supersymmetric scenarios in which the gluino is the next-to-lightest supersymmetric particle (NLSP), with a mass sufficiently close to that of the lightest supersymmetric particle (LSP) that gluino coannihilation becomes important. One of these scenarios is the MSSM with soft supersymmetry-breaking squark and slepton masses that are universal at an input GUT renormalization scale, but with non-universal gaugino masses. The other scenario is an extension of the MSSM to include vector-like supermultiplets. In both scenarios, we identify the regions of parameter space where gluino coannihilation is important, and discuss their relations to other regions of parameter space where other mechanisms bring the dark matter density into the range allowed by cosmology. In the case of the non-universal MSSM scenario, we find that the allowed range of parameter space is constrained by the requirement of electroweak symmetry breaking, the avoidance of a charged LSP and the measured mass of the Higgs boson, in particular, as well as the appearance of other dark matter (co)annihilation processes. Nevertheless, LSP masses m χ 8 TeV with the correct dark matter density are quite possible. In the case of pure gravity mediation with additional vector-like supermultiplets, changes to the anomalymediated gluino mass and the threshold effects associated with these states can make the gluino almost degenerate with the LSP, and we find a similar upper bound.

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New cosmological and experimental constraints on the CMSSM

Cited by 200 publications

References 63 publications

Upper and Lower Limits on Neutralino WIMP Mass and Spin–Independent Scattering Cross Section, and Impact of New (g−2)_μMeasurement

Upper and Lower Limits on Neutralino WIMP Mass and Spin–Independent Scattering Cross Section, and Impact of New (g−2)_μMeasurement

The pMSSM10 after LHC run 1

Scenarios for gluino coannihilation

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New cosmological and experimental constraints on the CMSSM

Cited by 200 publications

References 63 publications

Upper and Lower Limits on Neutralino WIMP Mass and Spin–Independent Scattering Cross Section, and Impact of New (g−2)μMeasurement

Upper and Lower Limits on Neutralino WIMP Mass and Spin–Independent Scattering Cross Section, and Impact of New (g−2)μMeasurement

The pMSSM10 after LHC run 1

Scenarios for gluino coannihilation

Contact Info

Product

Resources

About

Upper and Lower Limits on Neutralino WIMP Mass and Spin–Independent Scattering Cross Section, and Impact of New (g−2)_μMeasurement

Upper and Lower Limits on Neutralino WIMP Mass and Spin–Independent Scattering Cross Section, and Impact of New (g−2)_μMeasurement